严重: Servlet.service() for servlet jsp threw exception java.lang.NullPointerException at org.apache.

pom文件配置
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>

<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.2</version>
<scope>provided</scope>
</dependency>

servlet-api  以及jsp-api不要勾选，因为tomcat已有会冲突。